March 22, 2012: For several nights in a row, the people of Clintonville, Wisconsin have been kept awake by loud, booming noises with some residents claiming that they could feel the earth shake and even reporting cracks in their basement walls. Audio and visual recordings have largely failed to detect anything apart from a single loud noise, though a seismic station about 40 miles west of the town has recorded "unusual ground shaking". City officials have investigated possible human causes:
"They checked water, sewer and gas lines, contacted the military about any exercises in the area, reviewed permits for mining explosives and inspected a dam next to City Hall. They even tested methane levels at the landfill in case the gas was spontaneously exploding."
Geologists have claimed that the ground beneath the town is solid, and that there are no known fault lines nearby. However, they speculate that the granite might react to the very low water table resulting from a very dry winter.